Do Environmental Taxes Stimulate Eco-Investments? Evidence from Seven EU Member States and the EU-27

Key findings from this study

This research indicates that:

• Environmental taxes show no statistically significant relationship with sectoral eco-investments after controlling for economic scale across seven EU countries and four sectors from 2014 to 2023.
• The strong absolute correlation between environmental tax revenue and eco-investment weakens to insignificance when both variables normalise by sectoral gross value added.
• Greanger causality testing confirms no directional relationship between environmental taxation and eco-investment in either direction.

Overview

This study examines whether environmental taxation in the European Union stimulates capital investments in ecological technologies across sectors. The analysis covers seven EU member states and aggregate EU-27 data from 2014 to 2023, focusing on four NACE Rev.2 sectors. The research addresses a gap in empirical evidence regarding environmental tax effectiveness as a policy lever for decarbonisation.

Methods and approach

The study employs a six-step empirical strategy on country-sector panel data. Preliminary diagnostic tests assess cross-sectional dependence, stationarity, and cointegration. Fixed-effects panel regressions incorporate control variables including eco-expenditures and gross value added growth, with sector interaction effects. Granger causality testing evaluates directional relationships. Nine robustness checks validate finding stability. All monetary values convert to real prices using 2015 as the base year.

Results

The analysis identifies a substantial scale effect: the absolute correlation between environmental tax revenue and eco-investments is very high, but this relationship disappears when both variables normalise by sectoral GVA, becoming statistically insignificant. Fixed-effects panel regressions detect no statistically significant relationship between the two variables. The Granger causality test fails to confirm causality in either direction, and inclusion of control variables or sector interaction terms does not alter this null finding. Nine robustness checks consistently confirm the absence of a robust direct relationship across all model specifications and alternative approaches tested.

Implications

The findings suggest that environmental taxation alone, without complementary mechanisms, does not demonstrably drive sectoral eco-investment decisions in the analysed EU context. The disconnect between absolute and normalised correlations indicates that scaling effects operate independently of tax policy effectiveness. Policymakers should reconsider reliance on taxation as a primary stimulus, integrating more targeted revenue deployment, sector-specific differentiation, and non-fiscal instruments such as regulatory standards or direct subsidies to manage financial transition risks. The results support a policy redesign emphasising combinations of instruments rather than taxation as a standalone tool.

Scope and limitations

This summary is based on the study abstract and available metadata. It does not include a full analysis of the complete paper, supplementary materials, or underlying datasets unless explicitly stated. Findings should be interpreted in the context of the original publication.